include/linux/iommu.h

   1 /*
   2  * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
   3  * Author: Joerg Roedel <joerg.roedel@amd.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  */
  18
  19 #ifndef __LINUX_IOMMU_H
  20 #define __LINUX_IOMMU_H
  21
  22 #include <linux/errno.h>
  23
  24 #define IOMMU_READ      (1)
  25 #define IOMMU_WRITE     (2)
  26 #define IOMMU_CACHE     (4) /* DMA cache coherency */
  27
  28 struct iommu_ops;
  29 struct iommu_group;
  30 struct bus_type;
  31 struct device;
  32 struct iommu_domain;
  33
  34 /* iommu fault flags */
  35 #define IOMMU_FAULT_READ        0x0
  36 #define IOMMU_FAULT_WRITE       0x1
  37
  38 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
  39                         struct device *, unsigned long, int, void *);
  40
  41 struct iommu_domain_geometry {
  42         dma_addr_t aperture_start; /* First address that can be mapped    */
  43         dma_addr_t aperture_end;   /* Last address that can be mapped     */
  44         bool force_aperture;       /* DMA only allowed in mappable range? */
  45 };
  46
  47 struct iommu_domain {
  48         struct iommu_ops *ops;
  49         void *priv;
  50         iommu_fault_handler_t handler;
  51         void *handler_token;
  52         struct iommu_domain_geometry geometry;
  53 };
  54
  55 #define IOMMU_CAP_CACHE_COHERENCY       0x1
  56 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
  57
  58 enum iommu_attr {
  59         DOMAIN_ATTR_MAX,
  60         DOMAIN_ATTR_GEOMETRY,
  61 };
  62
  63 #ifdef CONFIG_IOMMU_API
  64
  65 /**
  66  * struct iommu_ops - iommu ops and capabilities
  67  * @domain_init: init iommu domain
  68  * @domain_destroy: destroy iommu domain
  69  * @attach_dev: attach device to an iommu domain
  70  * @detach_dev: detach device from an iommu domain
  71  * @map: map a physically contiguous memory region to an iommu domain
  72  * @unmap: unmap a physically contiguous memory region from an iommu domain
  73  * @iova_to_phys: translate iova to physical address
  74  * @domain_has_cap: domain capabilities query
  75  * @add_device: add device to iommu grouping
  76  * @remove_device: remove device from iommu grouping
  77  * @domain_get_attr: Query domain attributes
  78  * @domain_set_attr: Change domain attributes
  79  * @pgsize_bitmap: bitmap of supported page sizes
  80  */
  81 struct iommu_ops {
  82         int (*domain_init)(struct iommu_domain *domain);
  83         void (*domain_destroy)(struct iommu_domain *domain);
  84         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
  85         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
  86         int (*map)(struct iommu_domain *domain, unsigned long iova,
  87                    phys_addr_t paddr, size_t size, int prot);
  88         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
  89                      size_t size);
  90         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
  91                                     unsigned long iova);
  92         int (*domain_has_cap)(struct iommu_domain *domain,
  93                               unsigned long cap);
  94         int (*add_device)(struct device *dev);
  95         void (*remove_device)(struct device *dev);
  96         int (*device_group)(struct device *dev, unsigned int *groupid);
  97         int (*domain_get_attr)(struct iommu_domain *domain,
  98                                enum iommu_attr attr, void *data);
  99         int (*domain_set_attr)(struct iommu_domain *domain,
 100                                enum iommu_attr attr, void *data);
 101         unsigned long pgsize_bitmap;
 102 };
 103
 104 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE           1 /* Device added */
 105 #define IOMMU_GROUP_NOTIFY_DEL_DEVICE           2 /* Pre Device removed */
 106 #define IOMMU_GROUP_NOTIFY_BIND_DRIVER          3 /* Pre Driver bind */
 107 #define IOMMU_GROUP_NOTIFY_BOUND_DRIVER         4 /* Post Driver bind */
 108 #define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER        5 /* Pre Driver unbind */
 109 #define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER       6 /* Post Driver unbind */
 110
 111 extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops);
 112 extern bool iommu_present(struct bus_type *bus);
 113 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 114 extern void iommu_domain_free(struct iommu_domain *domain);
 115 extern int iommu_attach_device(struct iommu_domain *domain,
 116                                struct device *dev);
 117 extern void iommu_detach_device(struct iommu_domain *domain,
 118                                 struct device *dev);
 119 extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 120                      phys_addr_t paddr, size_t size, int prot);
 121 extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 122                        size_t size);
 123 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 124                                       unsigned long iova);
 125 extern int iommu_domain_has_cap(struct iommu_domain *domain,
 126                                 unsigned long cap);
 127 extern void iommu_set_fault_handler(struct iommu_domain *domain,
 128                         iommu_fault_handler_t handler, void *token);
 129
 130 extern int iommu_attach_group(struct iommu_domain *domain,
 131                               struct iommu_group *group);
 132 extern void iommu_detach_group(struct iommu_domain *domain,
 133                                struct iommu_group *group);
 134 extern struct iommu_group *iommu_group_alloc(void);
 135 extern void *iommu_group_get_iommudata(struct iommu_group *group);
 136 extern void iommu_group_set_iommudata(struct iommu_group *group,
 137                                       void *iommu_data,
 138                                       void (*release)(void *iommu_data));
 139 extern int iommu_group_set_name(struct iommu_group *group, const char *name);
 140 extern int iommu_group_add_device(struct iommu_group *group,
 141                                   struct device *dev);
 142 extern void iommu_group_remove_device(struct device *dev);
 143 extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 144                                     int (*fn)(struct device *, void *));
 145 extern struct iommu_group *iommu_group_get(struct device *dev);
 146 extern void iommu_group_put(struct iommu_group *group);
 147 extern int iommu_group_register_notifier(struct iommu_group *group,
 148                                          struct notifier_block *nb);
 149 extern int iommu_group_unregister_notifier(struct iommu_group *group,
 150                                            struct notifier_block *nb);
 151 extern int iommu_group_id(struct iommu_group *group);
 152
 153 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 154                                  void *data);
 155 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 156                                  void *data);
 157
 158 /**
 159  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
 160  * @domain: the iommu domain where the fault has happened
 161  * @dev: the device where the fault has happened
 162  * @iova: the faulting address
 163  * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
 164  *
 165  * This function should be called by the low-level IOMMU implementations
 166  * whenever IOMMU faults happen, to allow high-level users, that are
 167  * interested in such events, to know about them.
 168  *
 169  * This event may be useful for several possible use cases:
 170  * - mere logging of the event
 171  * - dynamic TLB/PTE loading
 172  * - if restarting of the faulting device is required
 173  *
 174  * Returns 0 on success and an appropriate error code otherwise (if dynamic
 175  * PTE/TLB loading will one day be supported, implementations will be able
 176  * to tell whether it succeeded or not according to this return value).
 177  *
 178  * Specifically, -ENOSYS is returned if a fault handler isn't installed
 179  * (though fault handlers can also return -ENOSYS, in case they want to
 180  * elicit the default behavior of the IOMMU drivers).
 181  */
 182 static inline int report_iommu_fault(struct iommu_domain *domain,
 183                 struct device *dev, unsigned long iova, int flags)
 184 {
 185         int ret = -ENOSYS;
 186
 187         /*
 188          * if upper layers showed interest and installed a fault handler,
 189          * invoke it.
 190          */
 191         if (domain->handler)
 192                 ret = domain->handler(domain, dev, iova, flags,
 193                                                 domain->handler_token);
 194
 195         return ret;
 196 }
 197
 198 #else /* CONFIG_IOMMU_API */
 199
 200 struct iommu_ops {};
 201 struct iommu_group {};
 202
 203 static inline bool iommu_present(struct bus_type *bus)
 204 {
 205         return false;
 206 }
 207
 208 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 209 {
 210         return NULL;
 211 }
 212
 213 static inline void iommu_domain_free(struct iommu_domain *domain)
 214 {
 215 }
 216
 217 static inline int iommu_attach_device(struct iommu_domain *domain,
 218                                       struct device *dev)
 219 {
 220         return -ENODEV;
 221 }
 222
 223 static inline void iommu_detach_device(struct iommu_domain *domain,
 224                                        struct device *dev)
 225 {
 226 }
 227
 228 static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
 229                             phys_addr_t paddr, int gfp_order, int prot)
 230 {
 231         return -ENODEV;
 232 }
 233
 234 static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
 235                               int gfp_order)
 236 {
 237         return -ENODEV;
 238 }
 239
 240 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 241                                              unsigned long iova)
 242 {
 243         return 0;
 244 }
 245
 246 static inline int domain_has_cap(struct iommu_domain *domain,
 247                                  unsigned long cap)
 248 {
 249         return 0;
 250 }
 251
 252 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
 253                                 iommu_fault_handler_t handler, void *token)
 254 {
 255 }
 256
 257 int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group)
 258 {
 259         return -ENODEV;
 260 }
 261
 262 void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
 263 {
 264 }
 265
 266 struct iommu_group *iommu_group_alloc(void)
 267 {
 268         return ERR_PTR(-ENODEV);
 269 }
 270
 271 void *iommu_group_get_iommudata(struct iommu_group *group)
 272 {
 273         return NULL;
 274 }
 275
 276 void iommu_group_set_iommudata(struct iommu_group *group, void *iommu_data,
 277                                void (*release)(void *iommu_data))
 278 {
 279 }
 280
 281 int iommu_group_set_name(struct iommu_group *group, const char *name)
 282 {
 283         return -ENODEV;
 284 }
 285
 286 int iommu_group_add_device(struct iommu_group *group, struct device *dev)
 287 {
 288         return -ENODEV;
 289 }
 290
 291 void iommu_group_remove_device(struct device *dev)
 292 {
 293 }
 294
 295 int iommu_group_for_each_dev(struct iommu_group *group, void *data,
 296                              int (*fn)(struct device *, void *))
 297 {
 298         return -ENODEV;
 299 }
 300
 301 struct iommu_group *iommu_group_get(struct device *dev)
 302 {
 303         return NULL;
 304 }
 305
 306 void iommu_group_put(struct iommu_group *group)
 307 {
 308 }
 309
 310 int iommu_group_register_notifier(struct iommu_group *group,
 311                                   struct notifier_block *nb)
 312 {
 313         return -ENODEV;
 314 }
 315
 316 int iommu_group_unregister_notifier(struct iommu_group *group,
 317                                     struct notifier_block *nb)
 318 {
 319         return 0;
 320 }
 321
 322 int iommu_group_id(struct iommu_group *group)
 323 {
 324         return -ENODEV;
 325 }
 326
 327 static inline int iommu_domain_get_attr(struct iommu_domain *domain,
 328                                         enum iommu_attr attr, void *data)
 329 {
 330         return -EINVAL;
 331 }
 332
 333 static inline int iommu_domain_set_attr(struct iommu_domain *domain,
 334                                         enum iommu_attr attr, void *data)
 335 {
 336         return -EINVAL;
 337 }
 338
 339 #endif /* CONFIG_IOMMU_API */
 340
 341 #endif /* __LINUX_IOMMU_H */